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So, Continually the most popular released hacks are Light Platinum and Pokemon Uranium. But in terms on games that are as of this post unreleased, I would say personally Pokemon Phoenix Rising. They have pages on Reddit and the Pokecommunity.
As of now, Uranium 100%. It got a huge spike in popularity when it was shut down and also brought more attention to fan games in general.
It is slowing down though, since Insurgence has been taking more and more of its spotlight since the full version of it dropped.
For pre-released games, I would say Phoenix Rising. It's been appearing on numerous Top-10 lists and it's not even out yet (which honestly makes no sense in my opinion).